Saw-set.



G. M. LARSON.

SAW SET.

APPLICATION FILED APR. 22, 1909.

Patented June 14, 1910.

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CALEB M. LARSON, OF MINNEAPOLIS, MINNESOTA.

SAW-SET.

Application filed April 22, 1909.

Specification of Letters Patent.

Patented June 14, 1910.

Serial No. 491,423.

T 0 all whom it may concern:

Be it known that I, CALEB M. LARSON, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Saw-Sets; and I do hereby declare the following to be a full, clear, and exact description of the in-' vention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to provide a simple and highly efficient saw-set, and to this end it consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings: Figure 1 shows an improved saw-set in front elevation; Fig. 2 is a view chiefly in section on the line 00 00 of Fig. 1, with some parts shown in full; Fig. 3 is an end elevation of the saw-set; and Fig. 4 is a detail view in plan, showing the so-called anvil block removed from working position.

The body 1 of the tool is preferably a malleable iron or steel casting, provided at one end with a pair of curved arms 2 that are located on the same side of the longitudinal axis of the frame, and terminate at their outer ends in a flat approximately disk-like head 3, the axis of which is alined with the longitudinal axis of said frame, leaving a lateral opening 1 at the front side of the tool. At its other end, the frame 1 is provided with laterally spaced flanges 5, to which a pair of levers 6 and 7 are pivotally connected. At their pivotal ends, the levers 6 and 7 are shown as provided with rounded plunger engaging lugs 8, and stop lugs 9, which latter engage the frame 1 and limit the outward movements of the said levers. Mounted in the frame 1 for endwise movements longitudinally thereof, is a pair of plungers 10 and 11, the rear ends of which engage with the lugs 8 respectively of the levers 6 and 7.

The intermediate portion of the frame 1 is cut away as shown at 1". On the plungers 10 and 11, within the opening 1*, are coiled springs 12 and 13, respectively, which press against the outer extremity of the opening 1 and against the pins 1 1, shown as driven through the said plungers l0 and 11. These springs 12 and 13 therefore, normally hold the levers 6 and 7 with their stop lugs 9, bearing against the frame 1. The plunger 10 serves as the saw setting plunger, and the inner end thereof is preferably beveled. To the inner end of the plunger 11 a disk-like saw clamping head 15 is secured. For cooperation with the setting plunger 10, and the clamping head 15, a so-called anvil block is provided, and this anvil block is preferably in the form of a heavy disk 16, which is adjustably secured on the inner face of the head 3. The inner face of the anvil block 16 is provided with a marginal bevel 16 the bevel of which varies circumferentially from minimum to maximum, so that by rotation of said block, the portion having the desired degree of bevel may be turned into line with the setting plunger 10. The said anvil block is adjustably secured to the head 3 by a bolt 17, the head of which is shown as countersunk into said block, and the end of which is provided with a thumb nut 18 that clamps the outer face of said head 3. The intermediate portion of the bolt 17 is passed through a rectangular guide block 19, that is mounted for sliding movements in a slot 20 formed in the central portion of the head 3. The said anvil block 16 is thus mounted for rotary adjustments, and for sliding movements, the latter adjustment servin to project the beveled edge of the said anvi block more or less beyond the beveled end of the setting plunger 10, depending on the length of the saw tooth that is to be set. The amount of set that will be given to the saw tooth may be varied by rotary movement to the said anvil block.

The guide block 19 is set and held in different positions by a small screw 21 which is swiveled in the head 3, and is provided with a knurled head 22, by means of which it may be rotated to adjust said block 19 when the clamping nut is loosened. Preferably the anvil block 16 is marked or graduated on its periphery to indicate the different extents of its bevel 16 at different circumferential points.

The spring 12 which retracts the setting plunger 16 should be considerably stronger than the spring 13 which retracts the clamping plunger 11, and its head 15. When the springs are thus relatively strong, and the two levers are gripped in the hand and forced toward each other, the s ring 13 will first yield and permit the clamping head 15 to press the saw Y against the anvil block 16, and then the spring 12 will yield and the setting plunger 10 will be forced against the tooth of the saw, thereby setting the same. It will thus be seen, that the saw is clamped and firmly held before the setting plunger is forced against the tooth, and this insures accuracy in the upsetting action. 7

The improved saw-set, while of com aratively simple construction, is highly e 'cient for the purposes had in view, and is capable of such adjustments as are required to adapt the device for the setting of teeth of various kinds of saws.

What I claim is:

1. In a saw-set, the combination with a frame, of a lever actuated spring retracted setting plunger mounted in said frame, a guide block mounted in a projecting portion of said frame for sliding movement, an

anvil block mounted for sliding adjustment on the projecting portion of said frame and rotatively secured to said guide block and said anvil block provided on its working face with a varying bevel for cooperation with said setting plunger, substantially as described.

2. In a sawset, the combination with a frame, of a clamping plunger and a setting plunger mounted in said rame, levers for actuating said plungers, a relatively strong spring retracting said setting plunger and a relatively weak spring retracting said clamping plunger, a guide block slidably mounted in a recess in a projecting head portion of said frame, a screw swiveled in said head portion and having threaded engagement with said guide block for positively moving the same, an anvil block having its working face formed with a varying bevel for cooperation with said setting plunger, and said anvil block being rotatively secured to said guide block and arranged for sliding movement therewith, and means for clamping said anvil block to said head portion, substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

CALEB M. LARSON.

Witnesses:

ALICE V. SWANSON, HARRY D. KILGORE. 

